CVE-2026-63928: USB: serial: omninet: fix memory corruption with small endpoint

High 7.8 EPSS 0.2% Linux kernel

In the Linux kernel, the following vulnerability has been resolved: USB: serial: omninet: fix memory corruption with small endpoint Make sure that the bulk-out buffers are at least as large as the hardcoded transfer size to avoid user-controlled slab corruption should a malicious device report a smaller endpoint max packet size than expected.

CVE-2026-63928CVE identifier
7.8CVSS 3.1 base score (high)
0.2%EPSS: chance of exploitation in the next 30 days (higher than 6% of CVEs)
2026-07-19published

What do these terms mean? CVE · CVSS score · exploited (KEV) · EPSS · backported fix · all terms

What to do now

Check whether you run Linux kernel and which version (commands below).
Install the fixed version for your system: see “Patch it” below.
Reboot into the new kernel (uname -r to confirm); live patching (kpatch, Ubuntu Livepatch, SUSE kGraft/klp) can defer the reboot for some CVEs

Affected and fixed versions

Affected:

Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 180996f0ca774001944e4afa452d569ba2f6455c
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before b496e25ead5976bce2891dacaed09beb53a54f9f
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4e7d32189d6219beb7db37cd0ea36b6bac7dfedb
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 9a3860454bdfb765f936965e975c594352602ffc
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0bda1893e4cc4ad2b7dcdbaca246f2af688c6c2a
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0fee0ccac29e088d4bfab7e2d075725dcecd803d
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before f34cf2928387fba01a78381f3258c7e1428897d9
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 60df93d30f9bdd27db17c4d80ed80ef718d7226b
Linux Linux 2.6.12

Patch it

Use the commands for your system. Distribution packages often keep an older version number with the fix backported, so compare with the fixed package versions in the table below, not only with the upstream version.

Debian

sudo apt update
sudo apt install --only-upgrade linux-image-amd64

Ubuntu

sudo apt update
sudo apt install --only-upgrade linux-image-generic (or the installed flavour: linux-image-aws, -azure, -gcp, -virtual)

RHEL, AlmaLinux, Rocky, Oracle

sudo dnf upgrade --refresh kernel

Fedora

sudo dnf upgrade --refresh kernel

SUSE / openSUSE

sudo zypper refresh
sudo zypper update kernel-default

Amazon Linux

sudo dnf upgrade --releasever=latest kernel kernel6.12

Arch Linux

sudo pacman -Syu

Alpine

apk update && apk upgrade linux-lts linux-virt

FreeBSD

not Linux

General update steps for every system are on the Linux and Unix & BSD pages; after updating, see which services to restart.

Fix status in Linux distributions

Release	Package	Status	Fixed version / advisory
Debian 12	`linux`	fixed	`6.1.176-1`
Debian 13	`linux`	fixed	`6.12.94-1`
Debian testing	`linux`	fixed	`7.0.12-1`
Red Hat Enterprise Linux 9	`kernel`	affected
Red Hat Enterprise Linux 9	`kernel-rt`	affected
Red Hat Enterprise Linux 8	`kernel`	affected
Red Hat Enterprise Linux 8	`kernel-rt`	affected
Red Hat Enterprise Linux 7	`kernel`	affected
Red Hat Enterprise Linux 7	`kernel-rt`	affected
Red Hat Enterprise Linux 6	`kernel`	out of support scope
Red Hat Enterprise Linux 10	`kernel`	affected

From the Debian security tracker, Ubuntu CVE tracker and Red Hat Security Data API, refreshed every few hours.

Sources

Page generated automatically from official sources on 2026-11-03 18:05 UTC. Always confirm with your vendor's advisory.